 /*******************************************************************************
  * Copyright (c) 2000, 2007 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal.texteditor;

 import org.eclipse.swt.SWT;
 import org.eclipse.swt.widgets.Shell;

 import org.eclipse.jface.resource.JFaceResources;

 import org.eclipse.jface.text.IInformationControl;
 import org.eclipse.jface.text.IInformationControlCreator;
 import org.eclipse.jface.text.source.ILineRange;
 import org.eclipse.jface.text.source.ISourceViewer;
 import org.eclipse.jface.text.source.LineChangeHover;

 import org.eclipse.ui.editors.text.EditorsUI;



 /**
  * Change hover for text editors. Respects tab settings and text editor font.
  *
  * @since 3.0
  */
 public class TextChangeHover extends LineChangeHover {

     /** The last created information control. */
     private int fLastScrollIndex= 0;

     /*
      * @see org.eclipse.jface.text.source.LineChangeHover#getTabReplacement()
      */
     protected String getTabReplacement() {
         return Character.toString('\t');
     }


     /*
      * @see org.eclipse.jface.text.source.LineChangeHover#getHoverInfo(org.eclipse.jface.text.source.ISourceViewer, org.eclipse.jface.text.source.ILineRange, int)
      */
     public Object getHoverInfo(ISourceViewer sourceViewer, ILineRange lineRange, int visibleLines) {
         fLastScrollIndex= sourceViewer.getTextWidget().getHorizontalPixel();
         return super.getHoverInfo(sourceViewer, lineRange, visibleLines);
     }

     /*
      * @see org.eclipse.jface.text.source.IAnnotationHoverExtension#getHoverControlCreator()
      */
     public IInformationControlCreator getHoverControlCreator() {
         return new IInformationControlCreator() {
             public IInformationControl createInformationControl(Shell parent) {
                 SourceViewerInformationControl control= new SourceViewerInformationControl(parent, SWT.NO_TRIM | SWT.TOOL, SWT.NONE, JFaceResources.TEXT_FONT, EditorsUI.getTooltipAffordanceString());
                 control.setHorizontalScrollPixel(fLastScrollIndex);
                 return control;
             }
         };
     }
     
     /*
      * @see org.eclipse.jface.text.information.IInformationProviderExtension2#getInformationPresenterControlCreator()
      * @since 3.3
      */
     public IInformationControlCreator getInformationPresenterControlCreator() {
         return new IInformationControlCreator() {
             public IInformationControl createInformationControl(Shell parent) {
                 int shellStyle= SWT.RESIZE | SWT.TOOL;
                 int style= SWT.V_SCROLL | SWT.H_SCROLL;
                 return new SourceViewerInformationControl(parent, shellStyle, style, JFaceResources.TEXT_FONT, null);
             }
         };
     }

 }

